Decentralised power supply system from isolated DC energy source, e.g. for use in active array radar - uses inverter to supply AC bus=bar to which modular loads are connected via inductive control impedances

摘要

The system includes a DC energy source (S1) which feeds AC bus-bars (23) through an inverter (21) and transformer (22). Load modules (27,28,28,..), each embodying a rectifier, regulator and DC load, have individual coupling transformers (24,25,26,..), whose primaries are connected to the bus-bar through control elements (30,31,32,..). These may be current-limiting reactors, or optionally, transformers (33,34,35,..) may be used whose secondaries are normally short-circuited by transistor switch units (70,71,72,..). When any module load current exceeds a predetermined value, the associated switch opens the control secondary, effectively inserting a high impedance in the module supply within a microsecond. A microprocessor receives switch-state monitoring signals (TM1, TM2, TM3,..), and may issue control signals (TC1, TC2m TC3,..). In variants, the busbar, and/or source, is duplicated for added security. USE/ADVANTAGE - Esp. for avionics applications, e.g. active array radar. Module faults nullified without disturbing healthy modules significantly.